block/nbd: micro-optimization in nbd request completion

Add in-flight cmds to the tail. That way while searching
(during request completion),we will always get a hit on the
first element.

Signed-off-by: Chetan Loke <loke.chetan@gmail.com>
Acked-by: Paul.Clements@steeleye.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 061427a75d37..8957b9f0cfad 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -481,7 +481,7 @@ static void nbd_handle_req(struct nbd_device *nbd, struct request *req)
                 nbd_end_request(req);
         } else {
                 spin_lock(&nbd->queue_lock);
-                list_add(&req->queuelist, &nbd->queue_head);
+                list_add_tail(&req->queuelist, &nbd->queue_head);
                 spin_unlock(&nbd->queue_lock);
         }